Just as the name "Child of Miare" says, she's the reincarnation of Hieda Are, who could remember anything after seeing or hearing it once, and this lineage had more knowledge of Gensokyo than any others in the Human Village for generations.

初代御阿礼の子は転生の術を会得しており、自分が死んでも百数十年後には生まれ変わる事になっている。

The first Child of Miare was Aichi, who began the editing of the Gensokyo Chronicles. The Child of Miare knows the way for reincarnation, and is reborn after a century and a few decades after death.

御阿礼の子が生まれてくる事を、御阿礼神事と呼び、稗田家はお祭り騒ぎが起こっている。

The birth of the Child of Miare is called the Ceremony of Miare, and the Hieda family is filled with a festival mood.

御阿礼の子は本の編纂の為だけに生まれてくる。

The heir of Miare is born only for editing the book.

頭脳は発達しているが、その分体は弱く、只でさえ短命な人間の中でもさらに短命と不憫な人である。

The brain is well developed but her body is weak. She`s unfortunate for having a short life even amongst the short living humans.

その代わり、生まれると同時に、歴代御阿礼の子全員の記憶を持っていて、頭脳明晰であり稗田家の一般の人間よりも博識である。

In exchange, the child has the memories of every generation of the heirs of Miare at birth, and is very intellectual and more knowledgeable than any other member of the Hieda family.

During the era of Aichi, it was for the purpose of helping humans win against Youkai, but it lost its original purpose as Gensokyo became more and more peaceful, and is now used commonly as a way to read about interesting Youkai.

今では、幻想郷縁起は人間以外にも公開され、本来の意図とはかけ離れた物となっている。

Recently, it lost its original meaning completely, being opened to the public even for those that are not human.

さらに今回、大結界で閉ざされてから初めての御阿礼の子である。どういった内容の幻想郷縁起となるのか楽しみだ。

What's more, she's the first Child of Miare after Gensokyo was closed up by the Great Boundary. I look forward to see what kind of Gensokyo Chronicles those will be.